Retirement Plans - Schedule Of Net Benefit Costs (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
United States
Components of net periodic benefit costs
Interest cost	$ 172	$ 224
Expected return on plan assets	(247)	(230)
Recognized net actuarial loss	99	53
Net periodic pension cost	24	47
United Kingdom
Components of net periodic benefit costs
Interest cost	109	184
Expected return on plan assets	(254)	(250)
Amortization of prior service cost	26	26
Recognized net actuarial loss	165	329
Net periodic pension cost	$ 46	$ 289